Geometrical instrument for laying out roofs, hoppers, and the like



April 6 1926.,

GEOMETRICAL INSTRUMENT J. M. HUISENF'ELDT FOR LAYING OUT ROOF-S,- HOPPERS, AND THE LIKE Filed March 5, 1924 2 Sheets-Sheet 1 April 6,1926. v 1,579,366

J. M. HUISENFELDT GEOMETRICAL INSTRUMENT FOR LAYING OUT ROOFS, HOPPERS, AND THE LIKE ,2 Sheets-Shet 2 Filed March 5, 1924 Patented Apr. 6, 1926. i r

JOHN M. HUISENFELDT, OF MINNEAPOLIS, MINNESOTA.

GEOMETRIOAL INSTRUMENT FOR LAYING OUT BOOBS, HOPPEBS, AND THE LIKE.

Application filed. March 3, 1924. Serial No. 696,521.

7 To all whom it may concern: of the head 12 at the inner end thereof for Be it known that I, J OHN M. HUIsnN- swinging movement. g FELDT, a citizen of the United States, re- The bars 13 and 14 are 'connected at the1r siding at Minneapolis, in the county of outer ends by an angle tie-bar 16, and which '5 Hennepin and State of Minnesota, have inbars are in triangular arrangement. Formed vented certain new and useful Improvewith the back edge portion of the bar 13 is merits-in Geometrical Instruments for Layan inturned reinforcing flange 17, and ing out Roofs, Hoppers, and the like; and I formed with the back edge portion of the do hereby declare the following to be a full, bar 14 is an outturned flange18 that extends 10 clear, and exact description of the invention, parallel to the flange 11 and that closely ensuch as will enable others skilled in the art gages the front face thereof during the to which it 'appertains to make and use the movement of the square to and frOm llOrIIlal same. or Zero position. When the square is in My invention relates to geometrical instrunormal or zero position, the bar 13 extends 15' ments, and more particularly to suchinstriu parallel to the base bar 9, and the bar 1 1 ments as used in laying outr00fs,-hoppers extends perpendicular thereto, as shown in and the like, and has for its object topro- Fig. 2. The outer. faceof the bar 13 aflords vide such an instrument that is automatic in" a straight edge or guide surface 19, and the, its action. 1 inner face of the bar 14 aflords a straight 20 By the use of my instrument, the sam edge or guide surface 20 that is perpendicumay be r adily dj t d to giv th l th lar to the plane of the straight edge sur- Of hip, valley and jack rafters and guides face 19, and it is important to note that the for marking the cuts for common, hip, valplane of the straight edge surfaces 19 and 20 ley and jack rafters, and the fac c t f intersect at the axis of the hinge 15. The

25 roof boards over hips and valleys. straight edge 20 is graduated to aiford two In the accompanying drawings, which l s A an B and the flange 18 iS transillustrate the invention, like characters ins y graduated at C, and which gradudicate like parts throughout the several ations are arranged for ti n it views. the graduations of a scale D on the flange 11. 30 Referring to the drawings: This flange 11 is also graduated to afford a Fig. 1 is a back View of the invention; Scale v Fig. 2 is a face view of the m One end of a straight edge bar 21 is at- Fig, 3 i a b ck i f th i ti i tached to the front face of the head 12 by a perspective; hinge 22 for swinging movement in a plane 35 Fig. 1 is a face view of the same in perpendicular to the plane in which the spective r square is mounted to swing. It is important Fig, 5 i a b tt i ith some parts to note that the axes of the two hinges 15 broken away; and 22 are in the same plane, and which Fig. 6 is a detail View with some parts P121119 Perpendicular to the base bar 4.0- s cti n d on th 1i 6 6 f Fig 4; The outer face of the straight edge bar 21 .Fi 7 i a d t il i ith some parts affords a guide surface 23 that is graduated sectioned on the lin 7- 7 of Fi 3; d to'af'ford a scale F. To simultaneously oper Fig 8 i a d tail vi ith some -t ate the square and the straight edge bar 21, sectioned on the line 8- 8 f Fi 3 and automatically set the same for giving The invention includes a base bar 9-com- P p lengths and cuts 1 mount in the prising a bottom flange 10 and an upright angle of the base bill 9 a main Slide 24 112W- back flange'll in angular arrangement, At ing dovetail interlocking engagement at 25 one end of the base bar 9 is a tubular head With the bottom flange 10 of Said base bar 12 that is square in cross section, and the f r ravelling movement in the plane of the back and bottom walls thereof are construcmovement of the square. Rigidly secured to 1 tions of bottom and back flanges 10 and 11, i118 Slide 24 is a P arms the pp respectively. Said invention also include of which is flush with the upper face of said an upright square comprising a short bar 13 Slide, and between which arms the straightand a long bar 14, and which square is seedge bar 21 extends. On the outer ends of 55 cured at its corner by a hinge 15 to the top the arms 26 is a pair of inturned studs 27 that project into longitudinal channels 28 in the upper and lower surfaces of the straight edge bar 21. An auxiliary slide 29 is hinged at 30 to the upper face of the main slide 2st for swinging movement in the plane in which the square swings, and has dove-tail interlocking engagement with the outer face of the bar lat for travelling movement longi' tudinally thereon. The auxiliary slide 29 is provided with a set screw 31 arranged to impinge against the bar 151 and thereby hold said slide in different longitudinal adjustments on said bar. and in turn hold the main slide 2st in ditlerentadjustments.on the base bar 9.

A stop plate 32 has dove-tail interlocking engagement with the bar 1%, and is held in' position by a screw 3 and limits the outward movement of the main slide 2-1 on the bar 1 1.

A stop pin 34-, on the slide 24, limits the tilting movement of the auxiliary slide 29. An indicator 35 is secured 'to the auxiliary slid. 29 for co-operation with the scales A and B. An indicator 36 isformed integral with'the pin of the hinge 30 for co-operation with the scale E and an indicator 37 is formed with Ethe lower arm26 for co-0peration with the scale F.

The front edge of the bar 13 and an angle plate on the head 12 afford a'bearing 38 at one end of the base bar 9, and the two slides 24 and 29'aflord a secoiid bearing 39 at the other end of said base bar. These bearings 38 and 39 are provided to engage one of the edges and one of the sides of a timber to properly position the instrument.

The above described instrument may be adjusted to give the length of common rafters. together with the top and bottom cuts; the length of hip or valley rafters, together with the-bottom, top and side cuts; and the ditlerence in the length of. jack rafters and the bottom, top and side cuts thereof, at any pitch from a flat roof to a rise of six feetper foot of run.

\Vhen the indicator is at zero on the scales A and B, the instrument is set, as shown in Fig. 2. for a horizontal roof. Bv swinging the square on its hinge joint 15 and thereby impart a travelling movement to the slide 29 the indicator 35 carried by said slide is caused to move along the scales A and B from zero. Said scale A at the indicator 3:) will give the rise per foot of run of a common rafter. and which scale is graduated 12 to 1 inch, and the scale B at said indicator 35 will give the rise per 16 and 97/100 inches of run of hip or valley rafters. and which scale is graduated 17 to 1 inch. 7

After the instrument has been adjusted to give the rise per foot of run of a common rafter. as shown on scale A at the indicator 35-, said instrunient is' locked in this posi-' tion by the set screw 31. stated that scale A is scaled inches to 1 foot and graduated 12 to 1 inch. The operation of the instrument to give the rise per foot of a common rafter also automatically sets the indicator 36 on the scale E to give the lengthofthe common rafter per foot of run. The zero point on scale E is at the hinge joint 15, and is sealed 2 inches to 1 foot and graduated 12 to 1 inch. This ad justment of the instrument also automatically positions the indicator 3? on scale l to give the length of hip or valley rafters per 17 inches run and the zero point of this scale is at the hinge joint 22 and is scaled inches to one foot and graduated 12 to 1 inch. This adjustment of the instrument also automatically gives on scale D at the intersection of scale C therewith the length of jack rafters, and which scale C is marked 12-16-202-1" centers, and scale D is scaled one-half inch per foot and graduated 12 to one-half inch and its zero point is at the hinge joint 15. This adjustment of the instrument also automatically sets the straight edge bar 21 for side cuts for jack rafters by marking along guide Said adjustn'ientof the instrun'ient further automatically sets the long bar 14 of the square for top cuts. and for common and jack rafters by marking along said guide 20. and at the same time theshort bar 13 of the square is automatically set for bottom cuts and for common or jack rafters by marking along guide 1.9. Said adjustment of the instrument further automatially sets the straight edge bar 21 for face cuts on the roofboards over hip or valleyrafters by placing the base bar 9 against the end of the board to be cut and marking along guide During the use of the instrument to indicate different cuts the angle bearings 38 and 39 are positioned against a rafter or board.

Referring again to the adjustment of the instrument to find the rise per 16 and 97/100 inches per run of hip or valley rafters given on scale B at the indicator the instrument is locked by the set screw 31 when properly adjusted, and at which time the long bar '11 of the square is automatically set to give the top cut for a hip or valley rafter by marking along guide 20. This adjustment of the instrument also automatically sets the short arm of the square to give the bottom cuts of a hip or valley rafter by marking along guide 19. Said adjustment of the instrument also automatically sets the straight edge bar 21 to give the side cuts for a hip or valley rafter by marking along guide 23.

lVhat I claim is:

1. A geometrical instrument comprising a base bar, a square having diverging straight edges. and a hinge connecting the square at the intersection of its straight edges to the base bar, the straight edge of the base bar It may be here and the two straight edges of the square being in planes that intersect at the axis of the hinge, said square being arranged to be set with one of its straight edges perpendicular to the straight edge of the base bar and with its other straight edge in the plane of the straight edge of the base bar, said base bar and perpendicular straight edge of the square having co-operating graduations, the graduations on the base bar being longitudinally spaced and the graduations on said straight edge being transversely spaced.

2. A geometrical instrument comprising a base bar, a square hinged at its corner to the base bar for movement to and from a position in which one of its straight edges extends perpendicular to the base bar and in which another of its straight edges extends parallel thereto, a straight edge bar hinged to the base bar for movement in a plane perpendicular to the plane in which the square moves, and a slide on thebase bar operative on the square and straight edge bar for imparting simultaneous movements thereto.

3. A geometrical instrument comprising a base bar, a square hinged at its corner to the base bar for movement to and from a position in which one of its straight edges extends perpendicular to the base bar and in which another of its straight edges extends parallel thereto, a straight edge bar hinged to the base bar for movement in a plane perpendicular to the plane in which the square moves, a main slide on the base bar movably connected to the straight edge bar, and an auxiliary slide on the perpendicular straight edge of the square and hinged to the main .slide, said two slides being arranged to impart simultaneous movements to the straight edge bar and the square during the slidingmovement of the main slide on the base bar.

4:. A geometrical instrument comprising a base bar, a square hinged at its corner to the base bar for movement to and from a position in which one of its straight edges extends perpendicular to the base bar and in which another of its straight edges extends parallel thereto, a straight edge bar having graduations and hinged to the base bar for movement in a plane perpendicular to the plane in which the square moves, said bar having longitudinal guide channels in the sides thereof, a main slide on the base bar having a pair of arms equipped with inturned studs slidably mounted in said channels, and an auxiliary slide. mounted on the perpendicular straight edge of the square and hinged to the main slide.

5. The structure defined in claim 4; in further combination with an indicator on one of said arms for co-operation with the graduations on the straight edge bar.

6. A geometrical instrument comprising a base bar, a square hinged at its corner to the base bar for movement to and from a position in which one of its straight edges extends perpendicular to the base bar and in which another of its straight edges extends parallel thereto, a straight edge bar hinged to the base bar for movement in a plane perpendicular to the plane in which the square moves, movable means on the base bar connected to the square and straight edge bar for imparting simultaneous movements thereto, said base bar and perpendicular straight edge of the square having co-operatingi graduations, the graduations on the base bar being longitudinally spaced and the graduations on said straight edges being transversely spaced, and an indicator on said movable means for co-operation with the graduations on the base bar.

7. The structure'defined in claim 3 in further combination with two indicators, one on the main slide and the other on the auxiliary slide for co-operation with graduations on the perpendicular straight edge of the square and the straight edge bar, respectively.

8. The structure defined in claim 3 in further combination with means for securing the slides in different longitudinal adjustments.

9. The structure defined in claim! 3 in which said main slide has dove-tail interlocking engagement with the base bar, and said auxiliary slide having dove-tail interlocking engagement with the penpendicular straight edge of the square.

10. The structure defined in claim 3 in further combination with means for securing the auxiliary slide to the perpendicular straight edge bar in different longitudinal adjustments thereon.

11. The structure defined in claim 8 in further combination with an indicator on one of said bars for co-operation with the graduations on the straight edge bar, and an indicator at the hinge of the auxiliary slide for co-operation with the scale on the base bar.

In testimony whereof I aflix my signature.

JOHN M. I-IUISENFELDT. 

